Structural versus Pipeline Composition of… (Experience Report)
summary
Claim: students find structural composition easier than pipeline composition for list higher-order functions. Method: restrict to a small set of list HOFs, give seven problems (three structural-only, three pipeline-only, one impossible) as input–output example pairs, and ask for generalised solutions. Result: nearly all students solve structural problems correctly, under 75% solve pipeline problems, with large uncertainty in written responses. Conclusion: preliminary evidence supports the difficulty gap; a coordinated multi-institution, multi-language follow-up is underway.
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